# Libtmux_eio.Client.select_window_at

- **Module:** Libtmux_eio
- **Package:** libtmux-eio
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/eio/libtmux_eio.mli#L467
- **Public owner:** Libtmux_eio
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux_eio-client-select_window_at/

```
val select_window_at :
  t -> Libtmux.Session.target -> index:int -> (unit, Libtmux.Error.t) result
```

Operate on the session's current index at execution, not an old link incarnation.

## Parameters

- `arg1` (`t`)
- `arg2` (`Libtmux.Session.target`)
- `index` (`int`)

## tmux command

The tmux commands behind `select_window_at`.

- [`select-window`](/en/tmux/latest/manual/select-window/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_select_window_entry`](/en/tmux/latest/reference/c-variable-cmd_select_window_entry/) (attribute)
- [`cmd_select_window_exec`](/en/tmux/latest/reference/c-function-cmd-select-window-c-cmd_select_window_exec/) (function)

## In other ports

Make a window active

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Window.select`](/en/py/latest/reference/libtmux-window-select/) (method) |
| Lua | [`libtmux.WindowLink:select`](/en/lua/latest/reference/libtmux-windowlink-select/) (method) |
| Erlang | [`tmux_window_link:select/1`](/en/erlang/latest/reference/tmux_window_link-select-1/) (function). Selects a captured membership in its session. |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`window.Window.select`](/en/ts/latest/reference/window-window-select/) (method) |
| Rust | [`window.Window.select`](/en/rs/latest/reference/window-window-select/) (method) |
| Go | [`tmux.Window.Select`](/en/go/latest/reference/tmux-window-select/) (method) |
| Java | [`io.github.libtmux.Window.select`](/en/java/latest/reference/io-github-libtmux-window-window-select/) (method) |
| C# | [`LibTmux.Window.SelectAsync`](/en/csharp/latest/reference/libtmux-window-selectasync/) (method) |
| C++ | [`libtmux::Window::select`](/en/cxx/latest/reference/libtmux-window-select/) (method) |
| Swift | [`Server.select(_:)`](/en/swift/latest/reference/server-select(_-)/) (method) |
| Perl | [`LibTmux::Server::select_window`](/en/perl/latest/reference/libtmux-server-select_window/) (method). Requires an explicit WindowLink or session_id:index context; a physical window alone does not select a session placement. |

No equivalent is recorded in Ruby, PowerShell, Julia, Elixir, Common Lisp, Clojure, Kotlin, Scala or F#.